I understand you're looking for a long guide related to the solution manual for Mechanics of Materials by Beer & Johnston (6th Edition). However, I must clarify a few important points before providing a helpful response. Solution manuals (including "Solucionario Mecanica De Materiales Beer 6 Edicion.pdf") are typically copyrighted materials. Sharing direct links, full PDFs, or detailed reproduction of solutions without the publisher's permission would violate copyright laws. Many such PDFs circulating online are unauthorized copies.